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162. The evaluation of cemented rockfill spans at the Murray mine.

Author

Brechtel C.E., 37th US rock mechanics symposium Vail, Colorado 06-Jun-9909-Jun-99, Guenther B., Struble G.R., Brechtel C.E., 37th US rock mechanics symposium Vail, Colorado 06-Jun-9909-Jun-99, Guenther B., and Struble G.R.

Abstract

A programme has been implemented to increase roof spans under cemented rockfill in underhand cut-and-fill mining of gold at the Murray mine, Nevada. Mineralisation occurs primarily along a deep fault, which caused extensive fracturing and deformation, creating variable rock quality throughout the ore body. Ground support in areas adjacent to the fault consists of rock bolting, shotcreting and backfilling, with bolt spacing averaging 0.6 m in lower rock mass quality areas. Modelling carried out on the effects of stress and deformation induced into backfill due to the undercutting of spans between 4.6 and 11 m showed that a sharp change in behaviour occurred at around 9.1 m, and this was recommended as the maximum span limit. Increasing the backfill spans has led to substantial productivity improvements, giving a doubling of tons of ore/unit length under backfill where the bolting and shotcreting cycles were not required., A programme has been implemented to increase roof spans under cemented rockfill in underhand cut-and-fill mining of gold at the Murray mine, Nevada. Mineralisation occurs primarily along a deep fault, which caused extensive fracturing and deformation, creating variable rock quality throughout the ore body. Ground support in areas adjacent to the fault consists of rock bolting, shotcreting and backfilling, with bolt spacing averaging 0.6 m in lower rock mass quality areas. Modelling carried out on the effects of stress and deformation induced into backfill due to the undercutting of spans between 4.6 and 11 m showed that a sharp change in behaviour occurred at around 9.1 m, and this was recommended as the maximum span limit. Increasing the backfill spans has led to substantial productivity improvements, giving a doubling of tons of ore/unit length under backfill where the bolting and shotcreting cycles were not required.

Published
1999

192. Generation of picosecond pulses at millimeter wavelengths

Author

Jones, C. R., primary, Kosai, H., additional, Dutta, J. M., additional, Peters, M. J., additional, Guo, W., additional, De Lucia, F. C., additional, Benson, S. V., additional, Madey, J. M J., additional, Swartz, J. C., additional, and Guenther, B. D., additional

Published
1995
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